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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc1e263db93aae1b477c9a244d0c3346313effd5e71221d558af1c5490f2efd' 
  AND token = 'QdQY3ENz7hafpM+tMHrNG7qzVmkkPTuiqE98VAztqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}